How Much Does a Whole-House Refurbishment Cost in London? A 2026 Line-by-Line Breakdown
Whole-house refurbishment in London is one of the most complex and high-value projects a homeowner can commission — and it is also one of the most frequently mis-budgeted. Indicative costs from online calculators rarely reflect London's labour market, the structural reality of Victorian and Edwardian stock, or the professional fees and statutory costs that regularly add 25–30% on top of the build figure. This guide breaks the numbers down honestly, line by line, so that you can plan and budget with confidence before a single contractor sets foot on site.
What "Whole-House Refurbishment" Actually Means
In London's design-and-build market, a whole-house refurbishment typically encompasses stripping a property back to structural shell, then rebuilding every internal element to a new specification. That means new first and second fix electrics, full replumbing, a new heating system, replacement or upgraded structural elements (lintels, joist repairs, party-wall works), new thermal insulation, plastering, joinery, kitchens, bathrooms, decoration, and often one or more extensions or loft conversions running in parallel.
The word "refurbishment" has no legal definition, which creates confusion. For the purposes of this article — and in line with how My Trusted Builder prices and contracts its work — a whole-house refurbishment means a programme that touches every room and every trade, on a single JCT Design and Build Contract, from planning and structural design through to handover with a signed Certificate of Practical Completion.
Projects of this scope in London's Zone 1–4 market typically run from £1,800/m² to £4,500+/m² of gross internal area, depending on specification tier, structural complexity, and the extent of extensions or changes in layout.
Cost by Specification Tier: Indicative 2026 London Figures
The single biggest variable in any refurbishment budget is specification level. The table below gives indicative 2026 London ranges across three tiers for a standalone whole-house programme. These figures reflect current London labour and material rates; they are not UK national averages.
| Tier | £/m² (GIA) | Typical scope markers | Indicative total (150 m² house) |
|---|---|---|---|
| Standard | £1,800 – £2,400 | Mid-range kitchen and bathrooms, standard joinery, decorator-grade finishes, standard boiler replacement | £270,000 – £360,000 |
| Premium | £2,400 – £3,400 | Bespoke joinery, high-end kitchen (e.g. Roundhouse, deVOL), feature bathrooms, underfloor heating throughout, smart home integration | £360,000 – £510,000 |
| Ultra/Luxury | £3,400 – £4,500+ | Architectural lighting design, stone cladding, lift installation, commercial-grade MEP, bespoke metalwork, full home automation (Crestron/Lutron) | £510,000 – £675,000+ |
Indicative 2026 London figures, exclusive of VAT and professional fees. GIA = Gross Internal Area.
These ranges do not include VAT, professional fees, or statutory costs — each of which is addressed below. For a premium 150 m² Victorian terrace with a rear extension, it is realistic to plan for an all-in budget of £450,000–£650,000 before the project begins.
Structural Works: The Cost That Surprises Most Homeowners
Structural works are frequently the most mis-anticipated line in a London refurbishment budget. Victorian and Edwardian terraces — which make up the majority of the housing stock in Zones 2–4 — were built to standards that do not meet current Building Regulations, and they have typically been subject to decades of incremental alteration, some of it undocumented.
Common structural cost items include:
- Steel beam installation for open-plan ground floors: £3,500–£9,000 per beam, inclusive of temporary propping, structural engineer sign-off, and reinstatement
- Joist replacement or sistering (ground and first floor): £8,000–£18,000 for a full-floor programme depending on extent
- Party Wall Surveyor fees: £1,500–£4,000 per adjoining owner under the Party Wall etc. Act 1996, depending on complexity and whether an agreed surveyor can be appointed
- Underpinning (where subsidence has occurred): £15,000–£35,000+ depending on extent and method
- Damp-proofing and timber treatment: £4,000–£12,000 for a full Victorian terrace programme
My Trusted Builder conducts a full structural survey and pre-contract assessment of every property before a fixed price is issued, so that structural unknowns are priced — not treated as post-contract variations. This approach is described in more detail in our structural design service.
MEP: Mechanical, Electrical, and Plumbing
MEP (Mechanical, Electrical, and Plumbing) works on a whole-house refurbishment are rarely optional. Building Regulations Part P (electrics), Part L (energy efficiency), and Part G (sanitation and hot water) all set minimum standards that apply when a whole property is re-wired or re-plumbed. Indicative 2026 London ranges:
- Full rewire (consumer unit, all circuits, sockets, lighting): £12,000–£22,000 for a 4–5 bedroom house
- Full replumb (mains, hot and cold distribution, drainage): £14,000–£26,000
- Heating system replacement (gas boiler + radiators): £8,000–£16,000; heat pump system: £15,000–£28,000 subject to government grant eligibility
- Underfloor heating (wet system, ground floor): £6,000–£12,000
- Mechanical ventilation with heat recovery (MVHR): £8,000–£14,000 installed
For premium projects, smart-home wiring infrastructure (CAT6, AV, Lutron lighting, Crestron) adds a further £15,000–£50,000+ depending on scope. This is best designed at RIBA Stage 2 rather than retrofitted, as structural and ceiling voids are far easier to use before plastering.
Kitchens, Bathrooms, and Fitted Joinery
Kitchens and bathrooms are the most visible cost lines in a refurbishment, and the most variable. The ranges below are for supply and installation on a typical London project:
| Item | Standard | Premium | Ultra / Bespoke |
|---|---|---|---|
| Kitchen (supply + fit) | £18,000 – £35,000 | £35,000 – £75,000 | £75,000 – £200,000+ |
| Principal bathroom (supply + fit) | £8,000 – £15,000 | £15,000 – £30,000 | £30,000 – £80,000+ |
| En suite (supply + fit) | £6,000 – £12,000 | £12,000 – £22,000 | £22,000 – £50,000+ |
| Bespoke fitted wardrobe (per room) | £3,000 – £6,000 | £6,000 – £14,000 | £14,000 – £35,000+ |
Indicative 2026 London figures, inclusive of supply, delivery, installation, and tiling works. Exclusive of VAT.
Note that kitchen figures above include appliances in the standard tier but may not at premium or ultra level, where client-specified appliances (Gaggenau, Wolf, Sub-Zero) are often supplied direct and installed by the contractor. This should be clarified in the Bill of Quantities before contracts are exchanged.
Professional Fees, Statutory Costs, and VAT
A common budgeting error is to treat the contractor's build cost as the whole-project cost. On a £400,000 build, professional fees and statutory costs typically add a further £60,000–£100,000. The main items to budget:
- Architect / designer fees: 8–15% of build cost for RIBA Stage 1–6 full service; or a fixed fee for planning and technical design only
- Structural engineer: £3,500–£8,000 for calculations, drawings, and site inspections on a typical terrace refurbishment
- Planning application fee: £528 per dwelling for most householder applications (2026 rates — confirm current fee schedule with your local authority)
- Building Control: £1,200–£3,500 for a full-plans application on a 3–4 storey terrace; or equivalent approved inspector fee
- Party Wall Surveyor fees: see structural section above
- Quantity Surveyor / cost consultant: £3,000–£8,000 for a full Bill of Quantities on a whole-house project — an investment that almost always saves money at tender stage
VAT is a significant cost. For a standard whole-house refurbishment on a property that has been in residential use, VAT is charged at the standard rate of 20%. VAT is reduced to 5% only where specific qualifying conditions apply — principally where a property has been empty for at least two years, or where the work converts a non-residential building to residential use. Do not assume reduced-rate VAT applies without a written opinion from your contractor and, if in doubt, from HMRC directly. On a £500,000 build at 20% VAT, the VAT alone is £100,000.
Contingency: Why 10% Is Not Enough
Industry guidance commonly cites a 10% contingency on construction projects. For a London whole-house refurbishment — particularly on Victorian stock — My Trusted Builder's experience consistently shows that the appropriate contingency is 15–20% of the pre-contingency build cost. The reasons are structural rather than commercial: London's older housing stock contains hidden voids, previous alterations without Building Regulations approval, asbestos in artex and floor tiles (common in houses built before 1985), and drainage layouts that bear no resemblance to what is documented.
On a well-specified project with a thorough pre-contract survey, a 15% contingency is rarely fully drawn. But a project that begins with 10% contingency and encounters a failing drain run or undiscovered chimney breast removal has no room to absorb that cost without client stress and programme delay. Budget the contingency; do not spend it unless it is needed.
What Drives a £500,000+ London Refurbishment?
Not every London home in Zones 2–4 costs £500,000+ to refurbish. The projects that consistently reach or exceed that threshold share several characteristics:
- Size: A 4–5 bedroom Victorian terrace of 180–220 m² at premium specification will approach £500,000 on build cost alone, before fees and VAT.
- Structural interventions: Open-plan ground floors with steel frames, loft conversions, and basement conversions each add £50,000–£120,000 to the programme.
- High-specification MEP: Heat pump systems, MVHR, full home automation, and architectural lighting specification routinely add £60,000–£100,000 over standard equivalents.
- Bespoke joinery and kitchen: A hand-painted, fully bespoke kitchen from a London maker, combined with fitted wardrobes across 4 bedrooms and a study, can represent £80,000–£150,000 of the programme.
- Programme length: An 8–12 month programme on site carries higher preliminary costs (site management, welfare, hoardings, insurance) than a shorter refurbishment. My Trusted Builder has delivered full Victorian-home refurbishments of this duration in Lewisham and Tower Hamlets, where the programme complexity and extent of structural repair were the primary drivers of both cost and duration.
Related MTB Services
How My Trusted Builder Approaches Whole-House Refurbishments
My Trusted Builder is a London design-and-build contractor working exclusively in Zones 1–4 on residential projects typically valued between £100,000 and £500,000+. Every whole-house programme is delivered under a single JCT Design and Build Contract — one fixed price, one point of contact from planning consent through to the handover Certificate of Practical Completion, and structural works backed by a guarantee of up to 20 years.
The process begins with a detailed pre-contract survey, structural assessment, and cost plan. We produce or commission a full Bill of Quantities before any contract is signed, so that the fixed price reflects the actual scope rather than an approximate schedule of rates. Clients receive a single project manager who coordinates every trade, every inspection, and every supplier relationship throughout the programme.
For architects and interior designers specifying a principal contractor for a demanding London refurbishment: MTB operates to RIBA stage protocols, maintains full PI and contractor's all-risk insurance, and is experienced in working alongside independent certifiers and employer's agents appointed under JCT contracts.
Further reading: Hidden Renovation Costs in London | How a Bill of Quantities Saves Money | Renovating a Victorian Terrace in London
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Tell us about your project and we will prepare a detailed, no-obligation cost estimate — with a fixed price, not a range, once the scope is agreed.
Get a free, fixed-price estimateFrequently Asked Questions
- How long does a whole-house refurbishment take in London?
- For a 3–4 bedroom Victorian terrace with a moderate structural programme (open-plan ground floor, loft conversion, new kitchen extension), a realistic on-site programme is 6–10 months. Larger or more complex projects — including full basement conversions or significant structural repair — typically run 10–14 months. The pre-construction phase (design, planning, structural calculations, procurement) adds a further 3–6 months before works begin on site. It is sensible to allow 12–18 months from first instruction to handover on a whole-house programme of significant scale.
- Do I need to move out during a whole-house refurbishment?
- In almost all cases, yes — at least during the structural, MEP first-fix, and plastering phases. Working around an occupied property significantly extends the programme, increases preliminary costs, and creates health-and-safety complications under the Construction (Design and Management) Regulations 2015. On a fixed-price contract, MTB will programme works on the assumption that the property is vacant; if phased occupation is required, this must be agreed at pre-contract stage and reflected in the programme and contract conditions.
- What is the difference between a refurbishment and a renovation?
- In UK construction practice, the terms are often used interchangeably in residential contexts. Technically, "refurbishment" tends to describe a more comprehensive programme — stripping back to structure, upgrading all services, and rebuilding to a new specification — while "renovation" can describe more selective improvement works. For the purposes of contracts, planning applications, and Building Control, the distinction that matters is the scope of works and whether the project triggers a full Building Regulations application (which a whole-house refurbishment almost always will).
- Can I get a fixed price for a whole-house refurbishment before I finalise the design?
- A genuinely fixed price requires a complete, co-ordinated set of contract documents: a full set of drawings, a specification, and a Bill of Quantities or Schedule of Works. Prices issued against outline designs or indicative briefs are cost plans, not fixed-price contracts, and they carry the risk of significant variation. My Trusted Builder will issue a cost plan at early stage to validate feasibility, but a fixed JCT Design and Build Contract price is only issued once the scope is fully defined. This protects both parties and is the basis on which our guarantee is issued.